120001221011121 has 16 divisors (see below), whose sum is σ = 165200534066688. Its totient is φ = 77402534832000.

The previous prime is 120001221011107. The next prime is 120001221011123. The reversal of 120001221011121 is 121110122100021.

It is a happy number.

It is not a de Polignac number, because 120001221011121 - 2⁶ = 120001221011057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120001221011121.

It is not an unprimeable number, because it can be changed into a prime (120001221011123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146320180 + ... + 147138021.

It is an arithmetic number, because the mean of its divisors is an integer number (10325033379168).

Almost surely, 2^{120001221011121} is an apocalyptic number.

It is an amenable number.

120001221011121 is a deficient number, since it is larger than the sum of its proper divisors (45199313055567).

120001221011121 is a wasteful number, since it uses less digits than its factorization.

120001221011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293462632.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 120001221011121 its reverse (121110122100021), we get a palindrome (241111343111142).

It can be divided in two parts, 120001 and 221011121, that added together give a palindrome (221131122).

The spelling of 120001221011121 in words is "one hundred twenty trillion, one billion, two hundred twenty-one million, eleven thousand, one hundred twenty-one".